<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <!-- 当我点击按钮添加一个内容，检测diffing算法 -->
    <button id="btn">修改DOM</button>
    <div id="app"> </div>

    <script type="text/babel">
        const vDOM = (
            <div>
                <h1>diffing算法</h1>
                <p>这是11111</p>
            </div>
        )

        const root = ReactDOM.createRoot(document.getElementById('app'))
        root.render(vDOM)

        const oBtn = document.getElementById('btn');
        oBtn.onclick=function(){
            const vDOM = (
            <div>
                <p>这是222222</p>

                <h1>diffing算法</h1>
            </div>
            
        )
        root.render(vDOM)
        }
        // diff算法的比较
        // Diff算法比较只会在同层级进行, 不会跨层级比较,如果当前层级不一致则直接替换
        // diff算法在某个层级比较一致的话,会进入层级内部再次比较,默认按照DOM书写顺序进行比较
</script>
</body>
</html>